William t



W. SI1-BAUM lvl. SHIDEL. Apparatus for, andProcess of,Extra,otng CasinPatented Nov. 27, 1877.

ililiif m l F from Oil andA Other Wells. NO.I197,538.

N. PETERSy FHOYO-LITMOGRAFHER/WASHINGTDN. D. C.

Uivrrnn STATES APA'rmvi'fClif-tiren WILLIAM T. BAUM AND ANDREW SHIDEL,OF FRANKLIN, PENNSYLVANIA.

IMPROVEMENT IN APPARATUS FORVAND PROCESSES 0F EXTRACTING CASINGS FROMOIL AND I OTHER WELLS.

Specicationforming part of Letters Patent N o. 197,538, dated November27,1877; application filed November 3, 1871.

' county of Venango and State of Pennsylvania,

have invented a new and useful Process of and Apparatus for ExtractingGasings from Oil and Other Wells, of which we declare the following tobe a full, clear, and exact descrip-- tion, reference being had to theaccompanying drawings, forming part of this specification, in which-- jFigure 1 is a vertical sectional elevation of an oil-well with itscasing and tubing, and provided with our improved apparatus. Fig. 2 is avertical elevation of our apparatus, partially in section 5 and Fig. 3is a top view of the same.

In order that our invention should be better understood, wel will first.fully describe the usual manner in which oil-wells are provided withcasings and tubing. r v

Referring to the drawings,I) represents lthe irst or upper section of awell, which, having been sunken to a proper depth, and of a diameterusually of eight inches, is provided with a casing, A, of five andfive-eighths inches, which casing, when in position, rests upon thebottom D of the well D. The casing A having thus been placed inposition, as described, the well is continued downward of a diameter ofve and one-half inches to such a depth as is necessary to strikeoil-bearing. rock.

A tubing, B, of three and one-fourth inches diameter is then placedwithin the tubing A, and extended from the top E of the well to a lpointin the well belowthe water-bearing rock,

and to va point above the surface of the oil. This tube B is suspendedin its described position by being supported at its upper extremity uponthe ground E or platform of the derrick by means of a clamp or otherlike device, which clamp necessarilypasses over the upper extremity ofthe casing A, in order to find al` bearing uponthe surface of the groundor derrick E.

F F represent packers,7 so called, which are employed to prevent waterfrom passing between the wall of the well and the tubing B to the bottomof the well, and't-hus becoming mingled with the oil. After the casing Bhas thusA been placed in -position a tubing, C, having adiameter of twoinches or less, is placed within the casing D, and extended downward toa point beneath the surface of the oil. This tubing rests upon thebottom of the Well during the process of extracting the casing A,hereafter to be described, Without setting forth the objectsto beattained by the successive proyision of the casings A and B, the officesof which are wellknowmit will be readily seen that it is impossible toextract or remove ythe casing A from the well after the introduction ofthe casing B,for the reason that the clamps or other devices by whichthe casing B is supported upon the ground E pass over the upperextremity of the casing A, and thus prevent its withdrawal from thewell. i It is a well-known fact that the casing A performs no usefuloffice in the well after the introduction of the casing B 5 hence, asthe casing A, if removed, can be employed in the process of sinkingother wells, and thus a large expense be avoided, which would beincident to the provision of a new casing, A, for each well sunk, it isimportant to provide such mode of suspending and supporting the casing Bas will allow the withdrawal of the casing A.

Our invention relates, therefore, to the process and apparatus forsupporting the inner and extracting the outer casing of wells; an tothis end it consists as follows:

vL is a hollow cylinder, of a diameter equal A The shaft G, atits upperextremity, isof such i lright-lined cross-section as to permit the shaftbeing revolved by a wrench or other like device, and is provided at itslower extremity with the enlarged cylindrical portion H, of greaterdiameter than the outer diameter o f the tubing Ga This enlarged portionH is at its lower extremityprovided with a projection, H', of slightlysmaller diameter than' the inner diameter of the tubing C. Y

Such being the construction of our apparatus, its mode of operation isas follows: When it is desired to withdraw the casing A from the well,the tubing C is allowed to rest on the bottom of the well, the upperportion of this tube C being provided on its .i outer surface with ascrew-thread. rEhe cylinderL is placed upon and connectedwith the upperpart of the casing B, above the clamps which support the casing B. Theshaft Gr is then screwed down through the block Kuntilthe portion Hrests upon theupper extremity of the tubing` C. The portion H is heldhorizontally in position upon the tubing G by means of a projection, H',projecting downward within it, and by means of an exterior cylindricalthimble, C', which may be placed around the line of contact of theshoulder H and tubing C, if found desirable.

The devices described having been thus placed in position, thescrew-threaded shaft Gr is moveddownward throughthe block K. The blockand its attached casing B is thus raised and supported. At this pointthe clamps or other devices which had hereto supported the casing B maybe removed, and thus the casi ing A is left free to be extracted fromthe well.

The casing A having been removed, the casground or der rck E, and thecylinder L and its attached devices disconnected from the casing B andremoved from the well.

It will, therefore, be readilyunderstood that an cicient, easy, andinexpensive means of removing casings from wells is provided.

Having thus described our invention, we claim as new and desire tosecure` by Letters Patent of the United Statesl. The mode of supportingland suspending the casing of a well, which is located between theinterior tubing and outer casing of said well upon said tubing, so thatthe exterior casing may be withdrawn from the we11,substan tially asshown and described.

2. The combination of the cylinder L, cylinder-block K, and shaft Gr,the whole forming a device for supporting the'casing of alwell upon itsinterior tubing', substantially as shown and describedi WILLIAM T. BAUM.ANDREW SHIDEL.

